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Always has been. States have never had free reign to do anything they want. This is one of the things they cannot do.
States already do things like bar felons from voting and only put on 3rd party candidates that meet a certain signature threshold. Or add barriers to voting, like restricting when you can vote and ID laws.
Pretty much how it goes. Laws affect peons: oh well. Laws affect wealthy politicians: off to SCOTUS for them to overturn it!